I love Rune because of its graphic and controls. The graphic is magnificent and its control is very easy (easy to learn but difficult to master is its trade mark, I believe). About the length of the game, I have to say that it's around 75+ hours. You may find it a bit difficult (and may be boring) in the first couples of dungeoun because it force you to practice jumping and swimming with other controls but it's getting more fun later on especially when you have to fight dozen of guys continuously.
Be advice as well that you will need a pretty good graphic card (GF2 MX should do it) and good cpu (Athlon 800MHz should work well). If you set resolution to 1280x1024x32, you will love the graphic you got. MPlayer is also good too but I am a bit of disappointed when I have to try join many game before I successfully join one but heh it's happen to other games as well (Diablo2 and BG2 is quite common).
Anyway, I can only say that I like it a lot. I give me the feeling of fighter walking into the deep dungeoun and you never know what will come up in the next corner =) BTW, you should be able to get it cheap by now. I got mine at around $30. It's should be less than $30 by now.